Send active campaigns to DPS

This updates the export job to only send active campaigns to DPS. This
code is temporary, but it serves as a reminder that when we update the
code for this job we only fetch records from active campaigns.

Author: thomasleese

app/jobs/dps_export_job.rb

@@ -4,7 +4,7 @@ class DPSExportJob < ApplicationJob
   queue_as :default
 
   def perform
-    campaign = Campaign.first # TODO: Not .first
+    campaign = Campaign.active.first # TODO: Not .first
     data = DPSExport.create!(campaign:).export!
     MESH.send_file(data:, to: Settings.mesh.dps_mailbox)
   end